1. There is a dated alternative 1st person plural present form είμεθα.2. The second, vowel-terminated, imperfect form is used informally.3. The present & imperfect forms are orally identical, the alternative imperfect forms can be used were differentiation is necessary.4. The imperfect forms ήταν and ήτανε have the dated alternatives ήσαν and ήσανε.